System and method of displaying images

• US 20020130892A1
• Filed: 10/26/2001
• Published: 09/19/2002
• Est. Priority Date: 10/31/2000
• Status: Active Grant

• Current Assignee: TP Vision Holding BV (TPV Technology Co., Ltd. (f/k/a Nanjing Huadong Electronics Information & Technology))
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Holtslag, Antonius Hendricus Maria
• Granted Patent: US 6,856,328 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: H04N 21/4318 by altering the content in the rendering process, e.g. blanking, blurring or masking an image region image enhancement or restoration in general G06T5/00
• CPC Class Codes: H04N 21/44008 involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream arrangements characterised by components specially adapted for monitoring, identification or recognition of video in broadcast systems H04H60/59
• CPC Class Codes: H04N 5/144 Movement detection for video coding H04N19/503; analysis of motion in general G06T7/20
• CPC Class Codes: H04N 5/57 Control of contrast or brightness
• CPC Class Codes: H04N 5/68 Circuit details for cathode-ray display tubes deviation circuits H04N3/16

Abstract

Logos may be present in images transmitted by television station. These logos are often present in the corners (102, 104) of an image (100) for a long time. They donot move and may comprise saturated colors. This results in burn-in effects in emissive displays because the logos provide the same display load at the same location for a relatively long time. The burn-in effect can be prevented by detecting the logos in the comers (102, 104) of the image (100) and reducing their intensity to the average display load.

Claims

1. A system (216) for displaying an image, which system comprises a selection means (202) adapted to select an area (102, 104) within the image, and a reduction means (212) adapted to reduce the light intensity of the image, characterized in that the system further comprises a motion detector (204) which is adapted to detect motion and a stationary part within the image, and in that the reduction means is adapted to reduce the light intensity of the stationary part within the area if motion has also been detected within the area.

2. A system as claimed in claim 1, wherein the system further comprises a first memory (206) adapted to comprise a running average of a quantity of motion in the area.

3. A system as claimed in claim 2, wherein the system further comprises a second memory (208) adapted to comprise a predetermined criterion with which the running average must comply so as to distinguish the stationary part from the moving part within the area.

4. A system as claimed in claim 3, wherein the system further comprises a third memory (210) adapted to comprise a predetermined minimal period of time during which the stationary part must comply with the criterion.

5. A system as claimed in claim 1, wherein the reduction means (212) is adapted to stepwise reduce the light intensity.

6. A method of displaying an image, wherein the method comprises the steps of selecting (300) an area within the image and reducing (312) the light intensity of the image, characterized in that the method further comprises a step (308) of detecting motion and a stationary part within the image, and in that the reduction step is performed for the stationary part if motion is also detected within the area.

7. A method as claimed in claim 6, wherein the method further comprises a step (306) of determining a running average of the quantity of motion within the area.

8. A method as claimed in claim 7, wherein the method further comprises a step (308) of distinguishing the stationary part from the moving part within the area if the running average complies with a predetermined criterion.

9. A method as claimed in claim 8, wherein the method further comprises a step (310) of determining whether the stationary part complies with the criterion during a predetermined minimal period of time.

10. A method as claimed in claim 6, wherein the method further comprises a step (312) of stepwise reducing the light intensity.